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Intangible Assets, Goodwill and Other | 6 Months Ended
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Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets Disclosure | Goodwill and Intangibles Changes in the carrying amounts of goodwill and intangible assets allocated to the pulp and paperboard segment as follows:
| Pulp and Paperboard
| Goodwill | Intangibles | Total
Balance as of December 31, 2023 | 35.1 |  | 6.4 |  | 41.5 |
Recognized goodwill | 13.7 |  | — |  | 13.7 |
Amortization | — |  | (1.1) |  | (1.1) |
Balance as of June 30, 2024 | $ | 48.8 |  | $ | 5.4 |  | $ | 54.1 |
Intangible assets consisted of $5.4 million customer relationships. Outstanding definite-lived intangible assets are amortized over their useful lives of 10 years. The gross book value and accumulated amortization of definite lived intangible assets at June 30, 2024 was $34.9 million and $29.5 million. The gross book value and accumulated amortization of definite lived intangible assets at December 31, 2023 was $34.9 million and $28.4 million.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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